BitStamp提币有问题，不知道跟反洗钱是否有关系，大家还是谨慎对待为好。
Bitstamp will not process withdrawal unless you prove the source of every coin you've ever traded on their exchange.

详见：
http://www.reddit.com/r/Bitcoin/comments/26apno/bitstamp_will_not_process_withdrawal_unless_you/